Relational database provide an efficient mechanism to store and retrieve structured data with ACID properties but it is not ideal for every scenario. Their scalability is limited because of huge data processing requirement of modern day systems. As an alternative NoSQL is different way of looking at a database, they generally have unstructured data and relax some of the ACID properties in order to achieve massive scalability. There are many flavors of NoSQL system, one of them is a key value store. Most of the key value stores currently available in the market offers reasonable performance but compromise on many important features such as lack of transactions, strong consistency and range queries. The stores that do offer these features lack good performance. The aim of this thesis is to design and implement VoloDB, a key value store that provides high throughput in terms of both reads and writes but without compromising on ACID properties. VoloDB is built over MySQL Cluster and instead of using high-level abstractions, it communicates with the cluster using the highly efficient native low level C++ asynchronous NDB API. VoloDB talks directly to the data nodes without the need to go through MySQL Server that further enhances the performance. It exploits many of MySQL Cluster’s features such as primary and partition key lookups and prune index scans to hit only one of the data nodes to achieve maximum performance. VoloDB offers a high level abstraction that hides the complexity of the underlying system without requiring the user to think about internal details. Our key value store also offers various additional features such as multi-query transactions and bulk operation support. C++ client libraries are also provided to allow developers to interface easily with our server. Extensive evaluation is performed which benchmarks various scenarios and also compares them with another high performance open source key value store.

Submitted by Claudia Rocha (claudia.rocha@udesc.br) on 2017-12-11T14:10:56Z No. of bitstreams: 1 PGEF17MA071.pdf: 3339958 bytes, checksum: 6c6ef4234c617d50586b53b12015fa7d (MD5) / Made available in DSpace on 2017-12-11T14:10:56Z (GMT). No. of bitstreams: 1 PGEF17MA071.pdf: 3339958 bytes, checksum: 6c6ef4234c617d50586b53b12015fa7d (MD5) Previous issue date: 2017-02-20 / The objective of the present work was to determine the technical parameters for the compaction and the quality of the pellets produced from different types of forest biomass and residual agricultural biomass. The choice of the types of biomass was based on the production volume of the main agricultural and forestry crops of the State of Santa Catarina, and the economic, social and environmental importsnce of the same for the segments that produce them. In this way, the physical, chemical and energetic properties of four types of agricultural and forest residual biomass (Pinus chip, apple pruning branches, pinyon faults and araucaria grimpa) were used to produce the pellets. Thirteen treatments in the study were analyzed, consisting of pellets produced with: 100% pinus (P100), considered as a control treatment; 75% pinus and 25% of one of the analyzed residues (F25P75, when the residue was pinion failure, G25P75, for the treatment containing grimpa, and Pm25P75, when the treatment had apple pruning); 50% of pine and 50% of other analyzed components, being F50P50 (for pinion failure), G50P50 (grimpa) and Pm50P50 (apple pruning); (F100P25), G75P25 (Grimpa) and Pm75P25 (apple pruning) and the homogeneous treatments with 100% of failure (F100); 100% grimpa (G100) and 100% apple pruning (Pm100). For each treatment was established for the ideal parameters of temperature, pressure and compaction of the pellets produced in laboratory pelletizer. These data were established based on the physical and chemical properties of biomasses in nature and also on the quality of the non-process obtained pellet by means of successive compaction tests. After production of the pellets a quality of this biofuel was determined by its physical, mechanical, chemical and energetic properties. From the results obtained in the laboratory, pellets were classified based on the quality criteria of ISO 17225-2 for biomass pellets for energy generation. It was concluded that the treatments F75P25, G75P25 G50P50 and G25P75 were the only ones that reached quality for residential and commercial use. The treatment with better quality for residential and commercial use was treatment G25P75. The treatments Pm100, Pm75P25, Pm50P50, Pm25P75 and G100 did not achieve average ratings in relation to ISO 17225-2 for any quality category described in the standard / O objetivo do presente trabalho foi determinar os parâmetros técnicos para a compactação e a qualidade dos pellets produzidos a partir de diferentes tipos de biomassa florestal e agrícola residual. A escolha dos tipos de biomassa foi baseada no volume de produção dos resíduos das principais culturas agrícolas e florestais do Estado de Santa Catarina, e da importância econômica, social e ambiental dos mesmos para os segmentos que os produzem. Desta forma, foram caracterizadas as propriedades físicas, químicas e energéticas de quatro tipos de biomassas residuais agrícolas e florestais (maravalha de pinus, galhos de poda de macieira; falhas de pinhão; grimpa de araucária) que foram utilizadas para a produção dos pellets. Foram analisados 13 tratamentos no estudo, que consistiram de pellets produzidos com: 100% de pinus (P100), considerado como tratamento testemunha; 75% de pinus e 25% de um dos resíduos analisados (F25P75, quando o resíduo era a falha de pinhão, G25P75, para o tratamento contendo grimpa, e Pm25P75, quando o tratamento possuía poda de maça); 50% de pinus e 50% de outro componente analisado, sendo F50P50 (para falha de pinhão), G50P50 (grimpa) e Pm50P50 (poda de maça); misturas contendo 25% de pinus e 75% do outro resíduo analisado, sendo F75P25 (falha de pinhão), G75P25 (grimpa) e Pm75P25 (poda de maça) e os tratamentos homogêneos com 100% de falha (F100); 100% de grimpa (G100) e 100% de poda de maça (Pm100). Para cada tratamento foram estabelecidos os parâmetros ideais de temperatura, pressão e velocidade de compactação dos pellets produzidos em peletizadora piloto de laboratório. Estes parâmetros foram estabelecidos com base nas propriedades físicas e químicas das biomassas in natura, e também em função da qualidade do pellet obtido no processo, por meio de testes de compactação sucessivos. Após a produção dos pellets foi determinada a qualidade deste biocombustível por meio de suas propriedades físicas, mecânicas, químicas e energéticas. A partir dos resultados obtidos em laboratório, os pellets foram classificados com base nos critérios de qualidade da norma ISO 17225-2 para pellets de biomassa para geração de energia. Concluiu-se que os tratamentos F75P25, G75P25 G50P50 e G25P75 foram os únicos que atingiram qualidade para uso residencial e comercial. O tratamento com melhor qualidade para uso residencial e comercial foi o tratamento G25P75. Os tratamentos Pm100, Pm75P25, Pm50P50, Pm25P75 e G100 não conseguiram classificações médias em relação a ISO 17225-2 para nenhuma categoria de qualidade descrita na norma

The main aim of this master thesis was the simultaneous detection of four selected plant viruses ? Apple mosaic virus, Plum pox virus, Prunus necrotic ringspot virus and Prune harf virus, by microarrays. The intermediate step in the process of the detection was optimizing of multiplex polymerase chain reaction (PCR).

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